An update on the imaging Fourier transform spectrometer for SCUBA-2

Gom, Brad; Naylor, David

doi:10.1117/12.552086

Cited by 6 publications

(4 citation statements)

References 10 publications

(7 reference statements)

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“…The upper left plot in shows the simulated 450 µm interferogram for a dual-band (450 / 850 µm) astronomical FTS [4] under construction for the James Clerk Maxwell Telescope (JCMT); the upper right plot shows the corresponding atmospheric transmission spectra multiplied by the filter characteristics [5]. Also shown in this figure are the interferogram sample points needed to recover these spectra based on the Nyquist criteria.…”

Section: Undersampled Step-and-integrate Techniquementioning

confidence: 99%

Increased Efficiency through Undersampling in Fourier Transform Spectroscopy

Naylor

Gom

Fulton

et al. 2005

Fourier Transform Spectroscopy/ Hyperspectral Imaging and Sounding of the Environment

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Section: Undersampled Step-and-integrate Techniquementioning

confidence: 99%

Increased Efficiency through Undersampling in Fourier Transform Spectroscopy

Naylor

Gom

Fulton

et al. 2005

Fourier Transform Spectroscopy/ Hyperspectral Imaging and Sounding of the Environment

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“…Since the JCMT optical and structural framework designs are already fixed, the FTS-2 optical and mechanical designs are highly interdependent and tightly constrained. In order to fit the optics in the available space, the interferometer design is folded vertically 7 as shown in Fig. 3.…”

Section: Optical Designmentioning

confidence: 99%

“…While the FTS-2 resolution can be adjusted arbitrarily over the full range, the baseline plan is to provide only two resolution modes. The maximum resolution will be used for spectral line studies, while a lower resolution of ~0.1 cm -1 will be used for Spectral Energy Distribution (SED) measurements 7 . With the fixed detector frame rate, higher resolution comes at the expense of longer acquisition times.…”

Section: Resolutionmentioning

confidence: 99%

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Preliminary design of FTS-2: an imaging Fourier transform spectrometer for SCUBA-2

2006

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We present the preliminary design of FTS-2, an imaging Fourier transform spectrometer (IFTS) for use with SCUBA-2, the second generation, wide-field, submillimetre camera currently under development for the James Clerk Maxwell Telescope (JCMT). This system, which is planned for operation at the start of 2007, will provide simultaneous broadband spectral imaging across both the 850 and 450 µm bands with variable resolution ranging from resolving powers of R ~10 to 5000. The spectrometer uses a folded Mach-Zehnder configuration and novel intensity beam dividers. The mechanical and optical design of FTS-2 as of the Critical Design Review stage of the project are discussed, along with the interfaces with SCUBA-2 and the JCMT.

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Optical design of the SCUBA-2 FTS

Naylor

Gom

Zhang

2007

2007 Joint 32nd International Conference on Infrared and Millimeter Waves and the 15th International Conference on Terahertz El

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FTS-2, an imaging Fourier Transform Spectrometer (IFTS) for use with the SCUBA-2 sub-millimetre bolometer array camera on the James Clerk Maxwell Telescope (JCMT), is currently under development by the University of Lethbridge and will be operational in 2008. SCUBA-2 features two DCcoupled, monolithic TES filled arrays operating at 450 and 850 μm with a total of ~10,000 bolometers. With its larger format and increased sensitivity, SCUBA-2 promises a factor of 1000 increase in mapping speed compared to its predecessors. When coupled with SCUBA-2, FTS-2 will fill a niche between the dual band SCUBA-2 continuum images and the higher spectral resolution, but smaller images produced by the JCMT heterodyne facility instrument HARP-B. The preliminary design of the FTS-2 system has been presented elsewhere; here we review the final optical design of the instrument as the project enters the construction phase. Since the FTS-2 project began after the SCUBA-2 feed optics design was already well underway, the optical design of FTS-2 was tightly constrained and presented unique challenges. In order to maximize the use of the available space, FTS-2 incorporates a folded Mach-Zehnder design including corner cubes in the moving mirror assembly and powered optics with polynomial surfaces in the interferometer arms. A retractable pickoff mirror system allows SCUBA-2 to be used with or without the spectrometer. Both input ports are placed on the sky for atmospheric cancellation, and both output ports are imaged on separate quadrants of the SCUBA-2 arrays. INO (Institut National d'Optique), with guidance from the University of Lethbridge, optimized the optical model for FTS-2 using Zemax to maximize the instrument Field Of View (FOV) and efficiency over the desired resolution range. We present an overview of the optical design, and the projected performance of the IFTS in terms of achievable FOV, spot pattern and vignetting, at Zero Path Difference (ZPD) and for the 2 resolution modes (~0.1 and 0.006 cm -1 ).

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An update on the imaging Fourier transform spectrometer for SCUBA-2

Cited by 6 publications

References 10 publications

Increased Efficiency through Undersampling in Fourier Transform Spectroscopy

Increased Efficiency through Undersampling in Fourier Transform Spectroscopy

Preliminary design of FTS-2: an imaging Fourier transform spectrometer for SCUBA-2

Optical design of the SCUBA-2 FTS

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